JP2017228381A - Battery and manufacturing method of battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery in which airtightness is improved by suppressing occurrence of crack, while improving energy density, and moisture is prevented from entering into a laminate film exterior material enclosing an electrode laminate, and the like.SOLUTION: A battery has a laminate film exterior material (80) laminating at least a metal thin film layer (82) and a resin layer (83), an electrode laminate (60) which is housed in the laminate film exterior material (80) so as to be placed between the opposing resin layers (83), a first sealing part (91) placed between the internal space in the laminate film exterior material (80) housing the electrode laminate (60), and the external space of the laminate film exterior material (80), and a second sealing part (92) placed at a position separated from the first sealing part (91).SELECTED DRAWING: Figure 11

Description

  The present invention relates to a battery in which an electrode laminate as a power generation element is housed in a laminate film exterior material and has high energy density and airtightness, and a method for manufacturing such a battery.

  Lithium ion secondary batteries having large capacity density and mass density are mounted not only for portable devices such as mobile phones and digital cameras, but also for electric bicycles, electric motorcycles, electric cars and the like. With the diversification of battery applications, battery weight reduction and design freedom are required.

  As the battery exterior body, a laminate film exterior material in which a synthetic resin is laminated with a metal container, aluminum foil or the like is used. However, as a battery that satisfies the above needs, a lightweight and highly flexible shape laminate is used. There is an increasing demand for batteries using film exterior materials.

  A battery using such a laminate film exterior material has an electrode laminate in which a plurality of positive electrodes and a plurality of negative electrodes are laminated via a separator, and an electrolyte solution impregnating the electrode laminate is a laminate film exterior material. It has a structure in which the periphery of the laminate film exterior material is sealed by thermal welding.

  In the battery using the laminate film exterior material as described above, the periphery of the thermally welded laminate film exterior material is bent in order to reduce the area occupied by the battery.

For example, Patent Document 1 (Japanese Patent Laid-Open No. 2001-283799) includes an exterior member that covers a battery element and has a pair of sealing portions that project from the side surface of the battery element in a direction orthogonal to the side surface. The point which folds the said sealing part of a battery is disclosed.
JP 2001-283799 A

  According to the prior art, it is possible to reduce the area occupied by the battery and improve the energy density by folding the periphery of the heat-sealed laminated film exterior material, but on the other hand, the resin in the heat-welded part Therefore, there is a problem that a crack portion is generated due to stress due to bending, and moisture easily enters from the crack portion into the laminate film exterior material in which the electrode laminate and the electrolyte are sealed.

  The present invention solves the above problems, and a battery according to the present invention is provided between a laminated film exterior material in which at least a metal thin film layer and a resin layer are laminated, and the resin layer facing each other. An electrode laminate accommodated in the laminate film exterior material, an internal space in the laminate film exterior material accommodating the electrode laminate, and an external space outside the laminate film exterior material, The first sealing portion disposed between the first sealing portion and the second sealing portion disposed at a position separated from the first sealing portion.

  Moreover, the battery according to the present invention is characterized in that a bending resistant part is provided between the first sealing part and the second sealing part.

  In addition, the battery according to the present invention is characterized in that it is folded back at the bending resistant portion.

  In the battery according to the present invention, the resin layer in the bending resistant portion is welded, and the resin layer in the first sealing portion and the resin layer in the second sealing portion are connected. Features.

  Further, the battery according to the present invention is characterized in that a cross section of the metal thin film layer is covered with the resin layer welded.

  In addition, the battery manufacturing method according to the present invention includes a step of facing the resin layer in a laminate film packaging material in which at least a metal thin film layer and a resin layer are laminated, and electrode lamination between the opposed resin layers. A step of housing a body, an inner space in the laminate film exterior material in which the electrode laminate is accommodated by welding the resin layer in the laminate film exterior material in which the electrode laminate is accommodated, and the laminate film exterior material The laminate film exterior at a position farther from the electrode laminate than the sealing portion provided in the first sealing step that isolates the external space from the outside and the first sealing step And a second sealing step for welding the resin layer on the material.

  In addition, the battery manufacturing method according to the present invention is characterized in that the step of performing the second sealing is performed after the step of performing the first sealing is performed.

  Further, the battery manufacturing method according to the present invention is characterized in that the step of performing the first sealing and the step of performing the second sealing are performed simultaneously.

  According to the battery of the present invention, by reducing the area occupied by the battery, while improving the energy density, the generation of cracks is suppressed and the airtightness is improved, and the electrode laminate and the electrolyte are enclosed. It is possible to prevent moisture from entering the laminated film exterior material.

  Further, according to the battery manufacturing method of the present invention, by reducing the exclusive area, while improving the energy density, the generation of cracks is suppressed and the air tightness is improved, and the electrode laminate, the electrolyte solution, Thus, it is possible to manufacture a battery in which moisture is prevented from entering the inside of the laminate film packaging material in which is sealed.

1 is a perspective view of a battery 100. FIG. It is a perspective view of the battery 100 which has a bending structure. It is typical sectional drawing of A-A 'of FIG. FIG. 3 is a schematic cross-sectional view taken along the line A-A ′ of FIG. 2. It is a figure which shows the two laminated film exterior materials 80 which faced the resin layer 83 for heat welding. It is a figure which shows a mode that the resin layer 83 in the two laminated film exterior materials 80 is heat-welded with the welding jig | tool 200. FIG. It is a figure which shows the two laminated film exterior materials 80 heat-welded with the welding jig | tool 200. FIG. It is a figure which shows an example of the heat welding of the laminate film exterior material 80 in the battery 100 which concerns on this invention. It is a figure explaining the bending tolerance part 93 provided in the laminate film exterior material 80 in the battery 100 which concerns on this invention. It is a figure which shows a mode that the bending tolerance part 93 is welded and it becomes the welding resin connection part 87. FIG. It is a figure explaining an example of the manufacturing process of the battery 100 which concerns on embodiment of this invention. It is a figure explaining an example of the manufacturing process of the battery 100 which concerns on other embodiment of this invention. It is a figure explaining an example of the manufacturing process of the battery 100 which concerns on other embodiment of this invention. It is a figure explaining an example of the manufacturing process of the battery 100 which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, problems of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of the battery 100. FIG. 2 is a perspective view of the battery 100 having a bent structure.

  In the battery 100 according to the present invention, in order to reduce the area of the battery 100 viewed from the direction of the arrow X in FIG. 1 and FIG. 2 (stacking direction of the electrode stack 60), as shown in FIG. The third side 113 and the fourth side 114 are bent as indicated by B and B ′, respectively. However, the battery 100 according to the present invention is configured such that a crack portion does not occur due to stress caused by bending even when such a folding structure is adopted.

  When the battery 100 is viewed in the direction of the arrow X in FIGS. 1 and 2, the area of the battery main body 110 excluding the areas of the positive electrode extraction tab 120 and the negative electrode extraction tab 130 is defined as the area of the battery 100.

  When the battery 100 is viewed in FIGS. 1 and 2, the battery body 110 is opposed to the first side 111, the second side 112 that faces the first side 111, the third side 113, and the third side 113. And a fourth side 114. The positive electrode extraction tab 120 and the negative electrode extraction tab 130 are arranged to be extracted from the first side 111.

  In the present embodiment, as the battery 100, a lithium ion secondary battery that is one type of electrochemical element in which charge and discharge are performed by moving lithium ions between a negative electrode and a positive electrode will be described as an example. Can also be applied to other types of batteries.

  A battery 100 according to an embodiment of the present invention includes an electrode laminate 60 in which a plurality of positive electrodes and a plurality of negative electrodes are laminated via a separator, and an electrolyte solution (not shown) having a rectangular laminate film exterior material in plan view 80 is housed and sealed.

  The positive electrode has a rectangular positive electrode main body portion and a strip-shaped positive electrode terminal portion extending from the positive electrode main body portion. In the positive electrode main body, a positive electrode active material such as lithium cobalt composite oxide is applied to a thin plate-like aluminum plate.

  The negative electrode has a rectangular negative electrode main body portion and a strip-shaped negative electrode terminal portion extending from the negative electrode main body portion. In the negative electrode main body, a negative electrode active material such as graphite is applied to a thin nickel plate or copper plate.

  The positive terminal portion of the positive electrode is conductively connected to the positive lead tab 120. The negative electrode terminal portion of the negative electrode is conductively connected to the negative electrode extraction tab 130. An aluminum plate is used for the positive electrode extraction tab 120, and a nickel plate or a copper plate is used for the negative electrode extraction tab 130. When the negative electrode lead tab 130 is formed of a copper plate, the surface may be plated with nickel.

  The separator is a sheet-like member that can be impregnated with an electrolytic solution, such as a microporous film (microporous film), a nonwoven fabric, or a woven fabric, made of a thermoplastic resin such as polyolefin.

  The laminate film exterior member 80 is composed of two laminate films surrounding and sandwiching the electrode stack 60 from both sides in the stacking direction, and the first side 111 and the second side on the opposing surfaces that overlap each other around the electrode stack 60. 112, the third side 113, and the fourth side 114 are thermally welded to seal the electrode stack 60 together with the electrolytic solution (not shown).

  In this embodiment, the electrode laminate 60 and the electrolyte solution (not shown) are sealed with two laminate films. However, the electrode laminate 60 and the electrolysis are folded so that one laminate film is folded. It is good also as a structure which seals a liquid (not shown).

  Now, the welded portion between the laminate film exterior materials 80 as described above will be described in more detail. FIG. 3 is a schematic cross-sectional view taken along the line A-A ′ of FIG. 1. In FIG. 3, the legend showing the members based on the fill pattern in the box can be used in other similar drawings.

  As a laminate film constituting the laminate film exterior material 80, as long as it has flexibility and can seal the electrode laminate 60 and the electrolyte (not shown) so that the electrolyte does not leak, The film generally used for this kind of film-clad battery can be used.

  As a typical layer structure of a laminate film used for the laminate film exterior material 80, a metal thin film layer 82 and a heat-weldable resin layer 83 are laminated, and further, a heat-weldable resin layer 83 of the metal thin film layer 82 is laminated. Further, there is a configuration in which a protective resin layer 81 made of a film of polyester such as polyethylene terephthalate or nylon is laminated on the opposite surface. When sealing the electrode laminate 60 and the electrolytic solution, the electrode laminate 60 is surrounded by the heat-weldable resin layer 83 facing each other.

  As the metal thin film layer 82, for example, a foil made of Al, Ti, Ti alloy, Fe, stainless steel, Mg alloy or the like having a thickness of 10 μm to 100 μm can be used.

  The resin used for the heat-weldable resin layer 83 is not particularly limited as long as it is a resin that can be heat-welded. For example, polypropylene, polyethylene, acid modified products thereof, polyphenylene sulfide, polyester such as polyethylene terephthalate, etc. Polyamide, ethylene-vinyl acetate copolymer and the like can be used. The thickness of the heat-weldable resin layer 83 is preferably 10 μm to 200 μm, more preferably 30 μm to 100 μm.

  The protective resin layer 81 and the heat-weldable resin layer 83 may be formed by stacking a plurality of different resins.

  In FIG. 3, a portion where the heat-weldable resin layer 83 in the laminate film exterior member 80 is opposed and heat is applied to the resin layer 83 is shown as a welded resin portion 85 as in the legend. .

  Here, in order to reduce the exclusive area of the battery 100, as shown in FIG. 2, when the third side 113 and the fourth side 114 of the battery 100 are bent as indicated by B and B ′, respectively, the welded resin portion is obtained. 85 is harder than the resin layer 83 that is not thermally welded, so that a crack may occur due to stress caused by bending, as shown in FIG. 4 (AA ′ cross-sectional view in FIG. 2). There is.

  When such a crack portion is generated in the welded resin portion 85, moisture easily enters from the crack portion into the laminate film exterior member 80 in which the electrode laminate 60 and the electrolyte (not shown) are sealed. There was a problem.

  Therefore, in the battery 100 according to the present invention, the folding structure of the laminate film exterior material 80 is adopted, and the area occupied by the battery 100 is reduced, thereby improving the energy density and suppressing the generation of cracks. The purpose is to prevent the ingress of moisture into the laminate film exterior member 80 in which the electrode laminate 60 and the electrolyte (not shown) are sealed.

  First, how the welded resin portion 85 is formed when the laminate film exterior material 80 is joined by thermally welding the resin layers 83 of the laminate film exterior material 80 together.

  FIG. 5 is a view showing two laminated film exterior members 80 with the heat-welded resin layer 83 facing each other. FIG. 6 is a view showing a state in which the resin layer 83 in the two laminate film exterior materials 80 is thermally welded by the welding jig 200.

  The resin layers 81 of the two laminate film exterior materials 80 are brought into contact with each other by two heat-controlled welding jigs 200 and pressed from above and below. The heat applied to the laminate film exterior material 80 by the welding jig 200 reaches the resin layer 83 in the two laminate film exterior materials 80 and melts the resin layer 83, so that the resin layers 83 are welded together. It becomes the welding resin part 85.

  FIG. 7 is a view showing two laminated film exterior members 80 thermally welded by the welding jig 200. The resin layer 83 in the two laminate film packaging materials 80 is melted and then cured to form a welded resin portion 85. At both ends of the welding resin portion 85, a welding resin bulging end portion 86 is formed so as to protrude from the range pressed by the welding jig 200 so that the molten resin layer 83 swells. As described above, in such a welded resin portion 85, there is a possibility that a crack portion is generated by bending.

  Therefore, in the battery 100 according to the present invention, the bending resistant portion 93 that is resistant to bending is positively provided to give flexibility to bending.

  Next, the basic principle adopted by the battery 100 according to the present invention will be described. In the following embodiment, an example is described in which one bending-resistant portion 93 is provided and the laminate film exterior member 80 is bent once. However, two bending resistant portions 93 are provided and the laminate film exterior member 80 is provided. It is also within the scope of the present invention to fold the laminated film exterior material 80 a plurality of times by providing a plurality of bending resistant portions 93 such as when bending the film twice.

  FIG. 8 is a diagram showing an example of thermal welding of the laminate film exterior material 80 in the battery 100 according to the present invention. In FIG. 8, the heat-sealing of the resin layers 81 of the two laminate film exterior members 80 is the same as in the case described with reference to FIGS.

  In FIG. 8, the upper two welding jigs 200 and the lower two welding jigs 200 provided at an appropriate distance are used to heat the resin layer 83 in the two laminated film exterior members 80. Is applied and melted, and a welding resin portion 85 is provided at two locations. In this example, the case where two sets of upper and lower welding jigs 200 are provided with welding resin portions 85 at two locations at the same time has been described. However, the timing at which the welding resin portions 85 are provided at two locations is limited to this. It is not something. That is, the two welded resin portions 85 can be provided at different times.

  FIG. 9 is a view for explaining a bending resistant portion 93 provided in the laminate film exterior member 80 in the battery 100 according to the present invention. As shown in FIG. 8, the laminate film exterior member 80 is provided with welding resin portions 85 at two locations. The region where the welding resin portion 85 is formed is the first sealing portion 91, It is defined as the second sealing portion 92.

  More specifically, a sealing part that seals the electrode laminate 60 enclosed in the space inside the laminate film exterior member 80 and the side close to the electrolytic solution (not shown) is defined as a first sealing part 91. . It is defined that the ordinal number of the sealing portion increases as the distance from the electrode laminate 60 and the electrolytic solution (not shown) increases.

  In the region between the first sealing portion 91 and the second sealing portion 92, the weld resin portion 85 is not formed, and the resin layer 83 that is not welded is softer than the weld resin portion 85. ing. A region between the first sealing portion 91 and the second sealing portion 92 functions as a bending resistant portion 93 that is resistant to bending. By using such a bending resistant portion 93, the laminate film exterior member 80 can be bent as shown in FIG. 9B. In the bending resistant part 93, since the welding resin part 85 is not formed, the crack part etc. which were mentioned above do not generate | occur | produce.

  In the battery 100 and the manufacturing method thereof according to the present invention, the laminate film exterior member 80 may be bent using the bending resistant portion 93 provided between the first sealing portion 91 and the second sealing portion 92. It becomes a feature point.

  In this example, although the case where the 1st sealing part 91 and the 2nd sealing part 92 were formed simultaneously was demonstrated, the time which forms the 1st sealing part 91 and the 2nd sealing part 92 may be shifted. it can. For example, after forming the first sealing portion 91, the second sealing portion 92 can be formed at a position that is some distance from the first sealing portion 91. In that case, a region between the first sealing portion 91 and a portion where the second sealing portion 92 is to be formed is defined as a bending resistant portion 93.

  Further, in the example shown in FIG. 9, the first sealing portion 91 and the second sealing portion 92 are formed side by side, but the arrangement relationship between the first sealing portion 91 and the second sealing portion 92 is also this. It is not restricted to such an example. For example, in the example illustrated in FIG. 13 later, the second sealing portion 92 is formed so as to surround the first sealing portion 91.

  Alternatively, the resin layer 83 in the bending resistant part 93 may be thermally welded after performing a predetermined bending process on the laminate film exterior member 80 using the bending resistant part 93. FIG. 10 is a view showing a state in which the bending resistant portion 93 is welded to form the welded resin connecting portion 87. In addition, in FIG. 10, illustration is abbreviate | omitted about the specific bending process in the bending tolerance part 93. FIG.

  After a predetermined bending process is performed on the bending resistant part 93 (the bending process is not shown in FIG. 10), when the resin layer 83 of the bending resistant part 93 is thermally welded as shown in FIG. There is an advantage that the bent shape by the processing is maintained, and even if time passes, it is difficult to return to the shape before the bending processing.

  Hereinafter, the manufacturing process of the battery 100 according to the present invention to be bent will be described with reference to the drawings.

  FIG. 11 is a diagram for explaining an example of the manufacturing process of the battery 100 according to the embodiment of the present invention.

  In the step shown in FIG. 11 (I), the resin layer 83 in the pair of laminate film exterior members 80 in which the electrode laminate 60 and an electrolyte solution (not shown) are sealed is opposed.

  In the subsequent step shown in FIG. 11 (II), heat is applied to the resin layer 83 in the two laminate film exterior members 80 by using the upper two welding jigs 200 and the lower two welding jigs 200. It is shown that the first sealing portion 91 and the second sealing portion 92 are formed by providing the welding resin portions 85 at two locations. A space between the first sealing portion 91 and the second sealing portion 92 formed in this step functions as a bending resistant portion 93.

  The welding jig 200 may perform temperature control such as cooling after applying heat to the laminate film exterior member 80. Moreover, it becomes possible to stabilize the melting conditions of the resin layer 83 by heating with the welding jig 200 from above and below as in this embodiment.

  In the next step shown in FIG. 11 (III), the laminate film exterior member 80 is bent as shown by an arrow B using the bending resistant portion 93. Since there is no weld resin portion 85 in the bending resistant portion 93, there is no room for a crack portion or the like to occur.

  In the next step shown in FIG. 11 (IV), in order to fix the bending process of the laminate film exterior member 80, heat is applied to the bending resistant part 93 by the welding jig 200, whereby the bending resistant part 93 After the resin layer 83 is melted, the resin layer 83 is solidified to form a welded resin connecting portion 87.

  In the present embodiment, the laminate film exterior member 80 is folded 180 ° in the step shown in FIG. 11 (III), but the angle at which the laminate film exterior member 80 is folded may be arbitrary. For example, the folding of the laminate film exterior material 80 can be 90 ° or the like.

  As described above, according to the battery 100 according to the present invention, by reducing the area occupied by the battery 100, while improving the energy density, the generation of cracks is suppressed and the airtightness is improved. It is possible to prevent moisture from entering the laminate film exterior member 80 in which 60 and an electrolyte (not shown) are enclosed.

  Moreover, according to the manufacturing method of the battery 100 according to the present invention, by reducing the occupied area, the generation of cracks is suppressed and the airtightness is improved while the energy density is improved, and the electrode stack 60 and the electrolytic layer are electrolyzed. It is possible to manufacture the battery 100 in which moisture is prevented from entering the inside of the laminate film exterior member 80 in which the liquid (not shown) is enclosed.

  Next, another embodiment of the present invention will be described. FIG. 12 is a diagram for explaining an example of the manufacturing process of the battery 100 according to another embodiment of the present invention.

  In the step shown in FIG. 12 (I), the resin layer 83 in the pair of laminated film exterior members 80 in which the electrode laminate 60 and the electrolyte solution (not shown) are sealed is opposed.

  In the subsequent step shown in FIG. 12 (II), the upper welding jig 200 and the lower welding jig 200 are used to apply heat to the resin layer 83 in the two laminated film exterior materials 80 to melt them, It shows that the welding resin portion 85 is provided at one place and the first sealing portion 91 is formed. A space between the first sealing portion 91 formed in this step and a portion where the second sealing portion 92 is to be formed functions as a bending resistant portion 93.

  In the step shown in FIG. 12 (III), the folding film exterior member 80 is bent as shown by an arrow B using the bending resistant portion 93. Since there is no weld resin portion 85 in the bending resistant portion 93, there is no room for a crack portion or the like to occur.

  In the step shown in FIG. 12 (IV), the entire welded portion including the first sealing portion 91 is heated by the upper welding jig 200 and the lower welding jig 200, whereby the unwelded resin layer 83 is obtained. Is formed as a welding resin portion 85, and a second sealing portion 92 is newly formed.

  By such a process, the second sealing portion 92 and the weld resin connecting portion 87 between the second sealing portion 92 and the first sealing portion 91 are formed. Thereby, the bending process of the laminate film exterior member 80 is fixed.

  Also according to the embodiment as described above, it is possible to enjoy the same effect as the previous embodiment.

  Next, another embodiment of the present invention will be described. FIG. 13 is a diagram for explaining an example of the manufacturing process of the battery 100 according to another embodiment of the present invention.

  In the step shown in FIG. 13 (I), the resin layer 83 in the pair of laminate film exterior members 80 in which the electrode laminate 60 and the electrolyte solution (not shown) are sealed is opposed.

  In the step shown in FIG. 13 (II), the upper welding jig 200 and the lower welding jig 200 are applied to heat and melt the resin layer 83 in the two laminate film exterior materials 80 at one location. It shows that the welding resin portion 85 is provided in the first sealing portion 91. A space between the first sealing portion 91 formed in this step and a portion where the second sealing portion 92 is to be formed functions as a bending resistant portion 93.

  Further, in the step shown in FIG. 13 (II), the upper laminate film exterior member 80 is folded in the direction of arrow C, and the lower laminate film exterior member 80 is folded in the direction of arrow C '.

  In the steps shown in FIGS. 13 (III) and (IV), the resin layer 83 of the sealing material M by the laminate film exterior material 80 comes into contact with the resin layer 83 of the laminate film exterior material 80 folded by arrows C and C ′. Thus, the sealing material M is attached.

  When the sealing material M is attached, as shown in FIG. 13 (IV), the resin layer 83 of the sealing material M is longer than the resin layer 83 of the laminate film exterior material 80 on the battery 100 side. The dimension of the sealing material M is prescribed | regulated.

  In the steps shown in FIGS. 13 (IV) and 13 (V), the upper welding jig 200 and the lower welding jig 200 heat the first sealing portion 91 and the entire portion including the sealing material M. Thus, the unwelded resin layer 83 is formed as the welded resin portion 85, and a second sealing portion 92 is newly formed. As shown in FIG. 13 (V), in the present embodiment, the second sealing portion 92 is formed so as to surround the first sealing portion 91.

  In this embodiment, as indicated by a dotted line D, the weld resin portion 85 is formed on the end cross section of the metal thin film layer 82. This is because the resin layer 83 that is excessive in the sealing material M melts and covers the exposed portion of the metal thin film layer 82 of the laminate film exterior material 80.

  Thus, the end portion of the metal thin film layer 82 can be easily covered without needing to protect the cross section of the end portion of the metal thin film layer 82 with a separate member or hiding the end portion by performing complicated processing. Therefore, even if a crack or the like occurs in the resin layer 83 inside the battery 100 and the laminate film exterior material 80 has a potential, current leakage to the outside can be effectively prevented.

  According to the present embodiment as described above, it is possible to receive the same effects as in the previous embodiment, and it is also possible to prevent current leakage to the outside.

  Next, another embodiment of the present invention will be described. FIG. 14 is a diagram for explaining an example of the manufacturing process of the battery 100 according to another embodiment of the present invention.

  In the step shown in FIG. 14 (I), the resin layer 83 in the pair of laminate film exterior members 80 in which the electrode laminate 60 and the electrolyte (not shown) are sealed is opposed.

  In the subsequent step shown in FIG. 14 (II), as shown by an arrow B, the laminate film exterior member 80 is bent. In this bending process, the space between the portion where the first sealing portion 91 is to be formed and the portion where the second sealing portion 92 is to be formed functions as the bending resistant portion 93. Since there is no weld resin portion 85 in the bending resistant portion 93, there is no room for a crack portion or the like to occur.

  In the next step shown in FIG. 14 (III), the upper welding jig 200 and the lower welding jig 200 are used to apply heat to the resin layer 83 in the laminate film exterior material 80 to melt it. The stop portion 91 and the second sealing portion 92 are formed at the same time.

  Further, by the step shown in FIG. 14 (III), the first sealing portion 91 and the second sealing portion 92 are also formed with a welded resin connecting portion 87 therebetween. Thereby, the bending process of the laminate film exterior member 80 is fixed.

  As described above, according to the battery according to the present invention, by reducing the area occupied by the battery, while improving the energy density, the generation of the crack portion is suppressed and the airtightness is improved, and the electrode laminate and the electrolytic solution are reduced. It becomes possible to prevent moisture from entering the inside of the enclosed laminate film exterior material.

  Further, according to the battery manufacturing method of the present invention, by reducing the exclusive area, while improving the energy density, the generation of cracks is suppressed and the air tightness is improved, and the electrode laminate, the electrolyte solution, Thus, it is possible to manufacture a battery in which moisture is prevented from entering the inside of the laminate film packaging material in which is sealed.

60 ... Electrode laminate 80 ... Laminate film exterior material 81 ... Resin layer (for protection)
82 ... Metal thin film layer 83 ... Resin layer (welding)
85 ... welding resin part 86 ... welding resin bulging end part 87 ... welding resin connecting part 91 ... first sealing part 92 ... second sealing part 93 ... bending resistance part DESCRIPTION OF SYMBOLS 100 ... Battery 110 ... Battery main-body part 111 ... 1st edge 112 ... 2nd edge 113 ... 3rd edge 114 ... 4th edge 120 ... Positive electrode extraction tab 130 ...・ Negative electrode extraction tab 200 ... welding jig

Claims (8)

A laminate film exterior material in which at least a metal thin film layer and a resin layer are laminated;
An electrode laminate housed in the laminate film exterior material so as to be disposed between the resin layers facing each other;
A first sealing portion disposed between the internal space in the laminate film exterior material containing the electrode laminate and the external space outside the laminate film exterior material;
A battery comprising: a second sealing portion disposed at a position separated from the first sealing portion. The battery according to claim 1, further comprising a bending resistant portion between the first sealing portion and the second sealing portion. The battery according to claim 2, wherein the battery is folded at the bending resistant portion. The resin layer in the bending resistant part is welded,
4. The battery according to claim 2, wherein the resin layer in the first sealing portion and the resin layer in the second sealing portion are connected. 5. The battery according to any one of claims 1 to 4, wherein a cross section of the metal thin film layer is covered with the resin layer to which the metal thin film layer is welded. A step of facing the resin layer in a laminate film packaging material in which at least a metal thin film layer and a resin layer are laminated;
A step of accommodating the electrode laminate between the opposed resin layers;
The resin layer in the laminate film exterior material containing the electrode laminate is welded, and an internal space in the laminate film exterior material containing the electrode laminate is isolated from an external space outside the laminate film exterior material. Performing a first sealing step,
A step of performing a second sealing by welding the resin layer in the laminate film exterior material at a position away from the electrode laminate from a sealing portion provided in the first sealing step; ,
A method for producing a battery, comprising: The method of manufacturing a battery according to claim 6, wherein the step of performing the second sealing is performed after the step of performing the first sealing. The method for manufacturing a battery according to claim 6, wherein the step of performing the first sealing and the step of performing the second sealing are performed simultaneously.

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